CN210530746U

CN210530746U - Sliding block type concentric reaming and pipe following drilling tool

Info

Publication number: CN210530746U
Application number: CN201921279231.5U
Authority: CN
Inventors: 谢伟才; 姚军
Original assignee: Hunan Xinjingang Machinery Equipment Co ltd
Current assignee: Hunan Xinjingang Machinery Equipment Co ltd
Priority date: 2019-08-08
Filing date: 2019-08-08
Publication date: 2020-05-15
Anticipated expiration: 2029-08-08

Abstract

The utility model discloses a sliding block type concentric reaming and pipe following drilling tool, which comprises a central drill bit, a sliding block, a drill tooth, a limiting pin and a steel ball, wherein a radial chute is arranged on the circumference of the head end of the central drill bit, and an inclined plane in the chute and the axis of the central drill bit form a certain acute angle; the sliding block is arranged in the radial sliding groove and can move along the inclined plane; the head ends of the central drill bit and the slide block are uniformly provided with drill teeth; a limiting groove is formed in the inclined surface along the moving direction of the sliding block, a detachable limiting pin penetrates through the sliding block, the axis of the limiting pin is consistent with that of the central drill bit, the end part of the limiting pin is matched with the limiting groove, and the steel ball is pressed into the limiting groove in clearance fit; the tail end of the inclined plane is provided with a supporting platform, and the tail end of the sliding block is provided with a supporting surface matched with the sliding block. The utility model aims at providing a concentric reaming with pipe drilling tool of slider formula, this drilling tool adopt slider formula reaming structure, through the optimization to the drilling tool structure, have strengthened the intensity of drilling tool, prolong the life of drilling tool by a wide margin.

Description

Sliding block type concentric reaming and pipe following drilling tool

Technical Field

The utility model belongs to the drilling tool field specifically is a concentric reaming with filling tool of slider formula.

Background

The down-the-hole drill is mainly used in the drilling blasting work under soft rock stratum and covering rock stratum, and the upper rock stratum is soft or has a covering material, so that the formed hole diameter can not be drilled in the drilling blasting, and the down-the-hole drill can be used for deeper drilling work only by fixing and forming in the upper loose rock stratum.

The utility model with the publication number of CN202325245U discloses a slide block type centering hole expanding drilling tool which comprises an impactor and a center drill bit arranged at the front end of the impactor, wherein a radial chute is arranged on the circumferential surface of the front end of the center drill bit, and two slide blocks which are symmetrical about the center of the drill bit are arranged in the chute; the sliding block is contacted with the central drill bit by an inclined plane of 45 degrees, and a limit pin is arranged on the sliding block. The utility model discloses designed on central drill bit to the heart slider, the slider is along the spout roll-off under the reaction force of rock face, advances simultaneously with the reaming diameter grow reaming in order to guarantee sleeve pipe and drilling system to put into the sleeve pipe of fixed loose rock stratum. When the drilling is completed and the pipe is withdrawn, the central drill bit is lifted upwards, the sliding block automatically slides back to the central drill bit along the sliding groove, synchronous follow-up of the casing and the drilling tool can be realized during drilling, the central drill bit freely withdraws from the casing during withdrawal, drilling hole forming efficiency is high, performance is reliable, production efficiency is greatly improved, and drilling cost is saved. The biggest drawback in this drilling tool use is that, the slider moves the back along the spout, only fixes a position through the spacer pin, along with the forward propulsion of center drill bit, and after long-term the use, the spacer pin fracture, drop, the slider drops from the spout, causes the damage of drilling tool, has increased manufacturing cost, consequently is necessary to improve the optimization to its structure.

SUMMERY OF THE UTILITY MODEL

The utility model aims at above problem, provide a concentric reaming with pipe drilling tool of slider formula, this drilling tool adopts slider formula reaming structure, through the optimization to the drilling tool structure, has strengthened the intensity of drilling tool, has prolonged the life of drilling tool by a wide margin.

In order to realize the above purpose, the utility model adopts the technical scheme that: a sliding block type concentric reaming and pipe following drilling tool comprises a central drill bit, a sliding block, drilling teeth, a limiting pin and steel balls, wherein a radial sliding groove is formed in the circumferential surface of the head end of the central drill bit, and an inclined surface in the sliding groove and the axis of the central drill bit form a certain acute angle; the sliding block is arranged in the radial sliding groove and can move along the inclined plane; the head ends of the central drill bit and the slide block are uniformly provided with drill teeth; a limiting groove is formed in the inclined surface along the moving direction of the sliding block, a detachable limiting pin penetrates through the sliding block, the axis of the limiting pin is consistent with that of the central drill bit, the end part of the limiting pin is matched with the limiting groove, and the steel ball is pressed into the limiting groove in clearance fit; the tail end of the inclined plane is provided with a supporting platform, and the tail end of the sliding block is provided with a supporting surface matched with the sliding block.

Furthermore, arc-shaped grooves are formed in the two inner side faces of the sliding groove along the moving direction of the sliding block, and arc-shaped teeth matched with the arc-shaped grooves are arranged on the two side faces of the sliding block.

Furthermore, a chamfer surface is arranged at the head end of the central drill bit; the head end of the sliding block is provided with an inclined table top in a certain gradient.

Furthermore, a cavity penetrating to the tail end along the axis direction of the central drill bit is arranged in the central drill bit, and a gas blowing hole penetrating into the cavity is formed in the head end of the central drill bit.

Further, the bevel is disposed at 45 ° to the central bit axis.

Furthermore, the drill teeth are made of hard alloy.

Further, the head of the drill tooth is shaped like a hemisphere, a semi-ellipse or a conical sphere.

The utility model has the advantages that: the drilling tool adopts a sliding block type reaming structure, the strength of the drilling tool is enhanced through the optimization of the drilling tool structure, and the service life of the drilling tool is greatly prolonged. In the utility model, the supporting surface on the sliding block is supported in a limiting way through the supporting platform, so that when the central drill bit is effectively prevented from being pushed forward, the sliding block continues to expand outwards, the limiting pin on the sliding block only prevents the sliding block from falling off from the sliding groove when the sliding block moves back to be drilled, the strength is increased, and the service life is greatly prolonged.

Drawings

Fig. 1 is a schematic view of the structure of the present invention.

Fig. 2 is a schematic view of the cross-sectional structure a-a of fig. 1 according to the present invention.

Fig. 3 is a schematic view of a part of the enlarged structure at B in fig. 1 according to the present invention.

Fig. 4 is a schematic perspective view of the present invention shown in fig. 1.

The text labels in the figures are represented as: 1. a center drill; 101. a chute; 102. a bevel; 103. a limiting groove; 104. a support table; 105. an arc-shaped slot; 106. chamfering; 11. a cavity; 12. a gas blowing hole; 2. a slider; 201. a support surface; 202. arc-shaped teeth; 203. an inclined table top; 3. drilling teeth; 4. a spacing pin; 5. and (5) steel balls.

Detailed Description

In order to make the technical solution of the present invention better understood, the present invention is described in detail below with reference to the accompanying drawings, and the description of the present invention is only exemplary and explanatory, and should not be construed as limiting the scope of the present invention.

As shown in fig. 1-4, the specific structure of the present invention is: a sliding block type concentric reaming and pipe following drilling tool comprises a central drill bit 1, a sliding block 2, drilling teeth 3, a limiting pin 4 and steel balls 5, wherein the tail end of the central drill bit 1 is connected with an impactor, a radial sliding groove 101 is formed in the circumferential surface of the head end of the central drill bit 1, and an inclined surface 102 in the sliding groove 101 and the axis of the central drill bit 1 form a certain acute angle; the slide block 2 is arranged in a radial slide groove 101 and can move along an inclined plane 102; one sliding block 2 corresponds to one sliding groove 101, in order to balance the stress of the drilling tool during drilling, at least two groups of sliding grooves 101 and sliding blocks 2 are uniformly distributed around the axis of a central drill bit 1, and the head ends of the central drill bit 1 and the sliding blocks 2 are uniformly provided with drilling teeth 3; bore tooth 3 and can adopt embedded setting, and

center drill bit

1 and 2 head ends of slider are equipped with the counter bore promptly, and the mode through the hot pressing will bore tooth 3 and impress in the counter bore, convenient processing, installation and change.

A limiting groove 103 is formed in the inclined surface 102 along the moving direction of the sliding block 2, a detachable limiting pin 4 penetrates through the sliding block 2, namely a pin hole is formed in the sliding block 2 along the axial direction of the central drill bit 1, the limiting pin 4 is matched with the pin hole, and the limiting pin 4 is limited and locked through an elastic check ring after being installed; the axis of the limiting pin 4 is consistent with that of the central drill bit 1, the end part of the limiting pin is matched with the limiting groove 103, the steel ball 5 is pressed into the limiting groove 103 in clearance fit, and the end part of the limiting pin 4 is in contact with the inner wall of the limiting groove 103 through the steel ball 5, so that the abrasion is reduced; the end of the inclined plane 102 is provided with a supporting platform 104, and the end of the sliding block 2 is provided with a supporting surface 201 matched with the supporting platform.

Preferably, arc-shaped grooves 105 are formed in two inner side surfaces of the sliding groove 101 along the moving direction of the sliding block 2, and arc-shaped teeth 202 matched with the sliding block 2 are formed in two side surfaces of the sliding block 2. The both sides of slider 2 are through arc tooth 202 and arc groove 105 cooperation, and for the rectangular channel, its adaptability is better, the condition of dying in the spout after slider 2 atress lateral force can not appear.

Preferably, the head end of the central drill bit 1 is provided with a chamfer surface 106; the head end of the slide block 2 is provided with an inclined table surface 203 in a certain gradient. The chamfer surface 106 ensures better centering precision during drilling and ensures better straightness during drilling by matching with the inclined table surface 203.

Preferably, a cavity 11 penetrating to the tail end along the axial direction of the center drill bit 1 is arranged in the center drill bit 1, and a blowing hole 12 penetrating into the cavity 11 is arranged at the head end of the center drill bit 1. The tail end of the cavity 11 is connected with an air source, and when pressure air passes through the cavity 11 and the air blowing holes 12, dust generated at the holes is cleaned.

Preferably, the bevel 102 is arranged at 45 ° to the axis of the central drill bit 1.

Preferably, the drill teeth 3 are made of hard alloy.

Preferably, the head of the drill tooth 3 is shaped like a hemisphere, a semi-ellipse or a cone-sphere.

When the punching device is used specifically, when the impactor is connected with the central drill bit 1 and performs reciprocating impact punching construction while rotating, the slide block 2 expands outwards along the sliding groove 101 after being stressed so that the punched diameter is enlarged to realize hole expansion, in the process, the support table 104 performs limiting support on the support surface 201 on the slide block 2, the slide block 2 is effectively prevented from expanding outwards when the central drill bit 1 is pushed forwards, the steel ball 5 is supported against the limiting groove 103 by the limiting pin 4 on the slide block, so that the slide block 2 is not separated from the sliding groove 101 when the drill is withdrawn, the strength is increased, and the service life is greatly prolonged; when the punching is finished and the impacter pulls the central drill bit 1 to retreat, the slide block 2 is retracted inwards along the sliding groove 101.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The principles and embodiments of the present invention have been explained herein using specific examples, which are presented only to assist in understanding the methods and their core concepts. The foregoing is only a preferred embodiment of the present invention, and it should be noted that there are objectively infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes can be made without departing from the principle of the present invention, and the above technical features can be combined in a proper manner; the application of these modifications, variations or combinations, or the application of the concepts and solutions of the present invention in other contexts without modification, is not intended to be considered as a limitation of the present invention.

Claims

1. A sliding block type concentric reaming and pipe following drilling tool comprises a central drill bit (1), a sliding block (2), drilling teeth (3), a limiting pin (4) and steel balls (5), and is characterized in that a radial sliding groove (101) is formed in the circumferential surface of the head end of the central drill bit (1), and an inclined plane (102) in the sliding groove (101) and the axis of the central drill bit (1) form a certain acute angle; the sliding block (2) is arranged in the radial sliding groove (101) and can move along the inclined surface (102); the front ends of the central drill bit (1) and the slide block (2) are uniformly provided with drill teeth (3);

a limiting groove (103) is formed in the inclined surface (102) along the moving direction of the sliding block (2), a detachable limiting pin (4) penetrates through the sliding block (2), the axis of the limiting pin (4) is consistent with that of the central drill bit (1), the end of the limiting pin is matched with the limiting groove (103), and the steel ball (5) is pressed into the limiting groove (103) in clearance fit; the tail end of the inclined surface (102) is provided with a supporting platform (104), and the tail end of the sliding block (2) is provided with a supporting surface (201) matched with the sliding block.

2. The sliding block type concentric reaming and casing drilling tool according to claim 1, characterized in that the two inner side surfaces of the sliding groove (101) are provided with arc-shaped grooves (105) along the moving direction of the sliding block (2), and the two side surfaces of the sliding block (2) are provided with arc-shaped teeth (202) matched with the sliding block.

3. The sliding block type concentric reaming and casing drilling tool according to claim 1, characterized in that the head end of the central drill bit (1) is provided with a chamfer surface (106); the head end of the sliding block (2) is provided with an inclined table surface (203) in a certain gradient.

4. The sliding block type concentric reaming and pipe following drilling tool as claimed in claim 1, wherein a cavity (11) penetrating to the tail end along the axial direction of the central drilling bit (1) is arranged in the central drilling bit (1), and a gas blowing hole (12) penetrating into the cavity (11) is arranged at the head end of the central drilling bit (1).

5. A slide-type concentric reaming and casing drilling tool according to claim 1, characterized in that the bevel (102) is arranged at 45 ° to the axis of the central drill bit (1).

6. The slide block type concentric reaming casing drilling tool according to claim 1, characterized in that the drilling teeth (3) are made of cemented carbide.

7. The slide block type concentric reaming and casing drilling tool according to claim 1, characterized in that the head shape of the drilling teeth (3) is hemispherical, semi-elliptical or conical spherical.